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/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Convert a trianglular mesh into a Radiance description. |
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* |
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#include "standard.h" |
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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#include "tmesh.h" |
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#define VOIDID "void" /* this is defined in object.h */ |
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#define CALNAME "tmesh.cal" /* the name of our auxiliary file */ |
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#define PATNAME "T-pat" /* triangle pattern name (reused) */ |
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#define TEXNAME "T-nor" /* triangle texture name (reused) */ |
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VERTEX *vlist = NULL; /* our vertex list */ |
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int nverts = 0; /* number of vertices in our list */ |
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typedef struct { |
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int ax; /* major axis */ |
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FLOAT tm[2][3]; /* transformation */ |
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} BARYCCM; |
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#define novert(i) ((i)<0|(i)>=nverts || !(vlist[i].flags&V_DEFINED)) |
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#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
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{ |
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static int ntri = 0; |
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BARYCCM bvecs; |
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FLOAT bvm[3][3]; |
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register int i; |
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/* compute barycentric coordinates */ |
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if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM)) |
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if (comp_baryc(&bvecs, v1->pos, v2->pos, v3->pos) < 0) |
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return; |
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/* put out texture (if any) */ |
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if (v1->flags & v2->flags & v3->flags & V_HASNORM) { |
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if (v1->flags & v2->flags & v3->flags & V_HASNORM && |
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!flat_tri(v1->pos, v2->pos, v3->pos, |
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v1->nor, v2->nor, v3->nor)) { |
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printf("\n%s texfunc %s\n", mod, TEXNAME); |
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mod = TEXNAME; |
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printf("4 dx dy dz %s\n", CALNAME); |
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printf("0\n16 "); |
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put_baryc(&bvecs); |
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printf("\t%14.12g %14.12g %14.12g\n", |
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v1->nor[0], v2->nor[0], v3->nor[0]); |
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printf("\t%14.12g %14.12g %14.12g\n", |
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v1->nor[1], v2->nor[1], v3->nor[1]); |
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printf("\t%14.12g %14.12g %14.12g\n", |
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v1->nor[2], v2->nor[2], v3->nor[2]); |
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printf("4 dx dy dz %s\n", TCALNAME); |
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printf("0\n"); |
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for (i = 0; i < 3; i++) { |
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bvm[i][0] = v1->nor[i]; |
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bvm[i][1] = v2->nor[i]; |
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bvm[i][2] = v3->nor[i]; |
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} |
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put_baryc(&bvecs, bvm, 3); |
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} |
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/* put out pattern (if any) */ |
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if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) { |
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printf("\n%s colorpict %s\n", mod, PATNAME); |
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mod = PATNAME; |
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printf("7 noneg noneg noneg %s %s u v\n", pn, CALNAME); |
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printf("0\n13 "); |
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put_baryc(&bvecs); |
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printf("\t%f %f %f\n", v1->ndx[0], v2->ndx[0], v3->ndx[0]); |
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printf("\t%f %f %f\n", v1->ndx[1], v2->ndx[1], v3->ndx[1]); |
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printf("7 noneg noneg noneg %s %s u v\n", pn, TCALNAME); |
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printf("0\n"); |
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for (i = 0; i < 2; i++) { |
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bvm[i][0] = v1->ndx[i]; |
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bvm[i][1] = v2->ndx[i]; |
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bvm[i][2] = v3->ndx[i]; |
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} |
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put_baryc(&bvecs, bvm, 2); |
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} |
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/* put out triangle */ |
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printf("\n%s polygon %s.%d\n", mod, obj, ++ntri); |
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printf("%18.12g %18.12g %18.12g\n", v1->pos[0],v1->pos[1],v1->pos[2]); |
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printf("%18.12g %18.12g %18.12g\n", v2->pos[0],v2->pos[1],v2->pos[2]); |
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printf("%18.12g %18.12g %18.12g\n", v3->pos[0],v3->pos[1],v3->pos[2]); |
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} |
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int |
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comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
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register BARYCCM *bcm; |
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FLOAT *v1, *v2, *v3; |
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{ |
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FLOAT *vt; |
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FVECT va, vab, vcb; |
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double d; |
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int ax0, ax1; |
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register int i, j; |
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/* compute major axis */ |
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for (i = 0; i < 3; i++) { |
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vab[i] = v1[i] - v2[i]; |
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vcb[i] = v3[i] - v2[i]; |
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} |
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fcross(va, vab, vcb); |
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bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
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bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
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ax0 = (bcm->ax + 1) % 3; |
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ax1 = (bcm->ax + 2) % 3; |
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for (j = 0; j < 2; j++) { |
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vab[0] = v1[ax0] - v2[ax0]; |
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vcb[0] = v3[ax0] - v2[ax0]; |
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vab[1] = v1[ax1] - v2[ax1]; |
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vcb[1] = v3[ax1] - v2[ax1]; |
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d = vcb[0]*vcb[0] + vcb[1]*vcb[1]; |
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if (d <= FTINY) |
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return(-1); |
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d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d; |
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va[0] = vab[0] - vcb[0]*d; |
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va[1] = vab[1] - vcb[1]*d; |
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d = va[0]*va[0] + va[1]*va[1]; |
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if (d <= FTINY) |
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return(-1); |
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bcm->tm[j][0] = va[0] /= d; |
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bcm->tm[j][1] = va[1] /= d; |
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bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]); |
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/* rotate vertices */ |
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vt = v1; |
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v1 = v2; |
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v2 = v3; |
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v3 = vt; |
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} |
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return(0); |
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} |
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put_baryc(bcm) /* put barycentric coord. vectors */ |
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register BARYCCM *bcm; |
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{ |
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printf("\t%d\n", bcm->ax); |
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printf("%14.8f %14.8f %14.8f\n", |
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bcm->tm[0][0], bcm->tm[0][1], bcm->tm[0][2]); |
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printf("%14.8f %14.8f %14.8f\n", |
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bcm->tm[1][0], bcm->tm[1][1], bcm->tm[1][2]); |
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} |
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